During the fighting at Fort Donelson, the U.S.A. Naval Forces, Western Division included the flagship U.S.S. St. Louis under Lieutenant Leonard Paulding, the U.S.S. Louisville under Commander Benjamin M. Dove, the U.S.S. Pittsburgh under Lieutenant Egbert Thompson, the U.S.S. Carondelet under Commander Henry Walke, the U.S.S. Conestoga under Lieutenant S. Ledyard Phelps, and the U.S.S. Tyler under Commander William Gwin. On February 12, 1862, at about 11:20 a.m., the U.S.S. Carondelet arrived below Fort Donelson and fired several rounds into the fort as a signal to General Grant; Captain Ross answered with the rifled gun and the Columbiad, and the gunboat withdrew to anchorage without causing damage. On February 13 in the morning, the U.S.S. Carondelet again moved up the river and fired 139 rounds from about one-half mile away. Captain Ross's 10-inch rifled gun replied, and one 128-pound solid shot passed through the forward casemate, struck the steam heater, and fell into the engine room without hitting anyone, though splinters injured several crewmen. The 32-pounder guns of the water batteries opened fire later, but the range was too great. The gunboat dropped back downriver, then returned and fired 45 more rounds before going back to anchorage. On February 14, at about 2 p.m., the entire fleet under Commodore Foote steamed up the river, with the four ironclads St. Louis, Louisville, Pittsburgh, and Carondelet abreast from right to left and the wooden gunboats Tyler and Conestoga some distance behind. At 3 p.m., the fleet opened fire from about one mile away and hurled projectiles against the fort and batteries. As the boats slowly closed to within 400 yards, the water and fort batteries answered with equal intensity and great accuracy. The action lasted about one and one-half hours and ended with all four armored boats disabled. The flagship alone was hit 59 times. Federal casualties were 54 killed and wounded. Commodore Foote was injured when a shell entered the pilot house of the flagship and killed the pilot, while the Confederate garrison suffered no casualties despite the intense bombardment.